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A Study on the Diverticular Enlargement of the Rat´s Submandibular Duct

Yonsei Medical Journal 1975년 16권 2호 p.41 ~ 46
Kim Soon-Chuol,
소속 상세정보
 ( Kim Soon-Chuol ) - Yonsei University College of Medicine Department of Anatomy

Abstract


As recently as 1972 research on the submandibular duct reservoir was reported by Butcher (1972) using Long-Evans and Wistar rats. The occurrence of the submandibular duct reservoir in other species of rodents has not been determined.
The author has attempted to observe the occurrence of the submandibular duct reservoir in adult albino rats of the Sprague-Dawleystrain as well as in mice and rabbits and to observe the morphodifferentiation of the submandibular gland, especially the submandibular duct reservoir in the rats.
The whole submandibular and sublingual ducts associated with the glands and the sublingual caruncle were carefully excised under a stereomicroscope after perfusing the animal with 10% formalin solution. The submandibular and sublingual complexes were, in toto, post-fixed in Zenker´s solution for 24 hours and sectioned serially. To observe the prenatal phase of the morphogenesis of the submandibular gland, serial sections of the head and neck at daily intervals from 14 days to 20 days in utero, were all fixed using Bouin´s solution.
The results have shown that in the serial sections of the glandular complexes of the adult rats, a diverticular enlargement of the submandibular duct near the sulbingual caruncle existed and was connected to the ordinary narrow excretory duct distal to the diverticular enlargement of the submandibular duct. The submandibular duct reservoir followed by the short terminal excretory duct opened into the oral cavity through the sublingual caruncle. The lining epithelium of the diverticular enlargement of the submandibular duct was the pseudostratified columnar type.
No sublingual duct reservoir was found in the Sprague-Dawley strain rats that were investigated.
In the mouse and the rabbit there was no submandibular duct reservoir found.
The anlage of the submandibular gland was first observed in the 14 day old in utero specimens. In the 17 day old in utero specimens, an apparent submandibular duct reservoir was present and the terminal buds (anlage of acini) were well differentiated. Secretory materials were seen in the lumina of the submandibular duct and in the terminal buds. These findings indicate that the secretion of the submandibular gland cannot enter the oral cavity until at least 16 days in utero.

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